Method of forming and applying cooling fins to tubular members



sept- 2, 1947- w. B. BRONANDER 2,426,920 IETHOD 0F FORMING AND APPLYING COOLING PINS TO TUBULAR "EIBERS Origipal Filed Aug. 20, 1942 /0 VI/IIII/II/Il I do Zl/I/I/II/II/S mvEN-roR Wilhelm flflmzzazzder Patented Sept. 2 21947 iun'rnon orr ronMmo AND 000mm FlNS room mime Wilhelm B. Bronander, Montclalr, N. J.

Orlginal application August 20,-1942, Serial at. 455,451, new patent No. 2,363,224, dated .No-.

vember 21, 1944. Divided November 18, Ill, Serial 3 Claims. (01. 29-1513) l This invention relates to a method of forming and applying a, cooling fin or heat exchange element to a tubular member or cylinder and this application is a division of application Serial No. 455,451, filed August 20, 1942which issued November 21, 1944. as Patent No. 2,363,224.

Cooling fins are usually formed integral with the tube or cylinder or are brazed or soldered thereto. The casting of fins integral with-the cylinder involves the use of expensive patterns and fins so cast are brittle. The brazing, welding or soldering of the fins to the tubular members or cylinders is expensive and time consuming and does not always result in a rigid and emcient joint.

This invention hasv for its salient object to provide a simple, practical and emcient method of forming and applying a cooling fin to a tube, cylinder or other member to.be cooled, in such a manner that the method can be expeditiously carried out and will result in forming a firm'and rigid connection without requiring brazing, soldering or welding.

Another object of the invention is to-provide a joint between a cooling fin and cylinder or tube so formed that heat will be emciently conducted from the tube or cylinder to the fin.

Further objects of the invention will appear from the following specification taken in connection with the drawings which form a part of this application, and inwhich Fig. 1 is a sectional elevation, broken away, of a fin structure constructed in accordance with the invention;

Fig. 2 is a sectional elevation through a portion of the wall of a cylinder or other member to be cooled, showing the fin illustrated in Fig. 1 anchored in the grooves therein;

Fig. 3 is a sectional elevation similar to Fig. 1 but illustrating'a slightly modified form of the invention;

Fig. '4 is a sectional elevation similar to Fig. 2 but illustrating the fin shown in Fig. 3 anchored in grooves formed in the wall of the member to be cooled; and

Fig. 5 is a diagrammatic sectional elevation illustrating means for anchoring the fin structure in the groove of the member to be cooled.

- In the form of the invention illustrated in Figs.

' 1 and 2, the fin structure is formed by bending or otherwise forming the walls I0 and II into parallel relation, the walls being connected by a bridge I2 of compressible material. I The fin walls and bridge take the form of a W and the legs 0! the W are spaced apart to receive a strip or and this application No. 584,084

, 2 wire ll formed oisuitable compressible material. The walls it and I I, the bridge l2 and the strip or wire or compressible material are so dimensioned that the connected edges and the wire can be inserted in a groove formed in the wall 25 of a cylinder or other member to be cooled. It will be noted that the assembled fin unit is insorted with the wire or strip l3 disposed at the bottom or the groove or enclosed within the bridge I2. After-the fin strip or unit has been inserted in the groove, pressure is applied to the outer surface of the bridge l2 in some suitable manner and in Fig. 5 there is shown a bar 25 which is engaged and forced downwardly by a roller 28. This bar 25 forces the bridge and the wire or strip it against the bottom or the groove and causes the walls l0 and Ii to be forced laterally into firm gripping engagement with the walls of the groove 20, thus firmly anchoring the fin structure in the groove and providing an efflcient heat conducting contact between the fin structure and the mem- A second roller 21 also engages the upper surface of the bar 25 to press down on the bar and to hold the fin structure in position.

The form of the invention illustrated in Figs. 3 and 4 is very similar to that illustrated in Figs. 1 and 2 but diflers therefrom in that the strip or wire of compressible material is tapered and the bridge or connecting portions or the fins is also tapered to receive the tapered strip orwire 30. This fin structure is anchored in the groove in the same manner as that above described and is illustrated in Fig. 4 in its anchored position.

Although certain specific embodiments of the invention have been particularly shown and described, it will be understood that the invention is capable of modification and that change in the arrangement and departing from the spirit or scope or the invenable, compressible material, inserting the double walied fins and wire in the groove withxthe wire at the bottom or the groove, and forcing the fin in the construction of the r various cooperating parts may be made without walls laterally by pressure against the outer por tion of said bridge, said pressure upsetting and expanding the deformable wire insert laterally against the fin walls thus compressing the bridge and the wire and anchoring the fin unit in the groove.

2. The method of forming and securing a radiating fin to a grooved member to be cooled which consists of inserting in the groove substantially parallel fin walls, the bottom portion of each wall having an integral portion folded back against said wall, inserting beneath said folded material a wire of' deformable, compressible material, inserting the double walled fins and wire in the groove with the wire at the bottom of the groove, and forcing the fin walls laterally by pressure against the outer portion of said folded portions, said pressure upsetting and expanding the deformable wire insert laterally against the fin walls thus compressing the portions and the wire and anchoring the fin unit in the groove.

3. The method of forming and securing a radiating fin to a member which consists of forming a strip of material intermediate'the longitudinal edges thereof into W shape with separated substantially parallel walls, inserting a wire of deformable, compressible material beneath the inverted V of the W, inserting the closed edge of the double walled fin and the compressible wire in the groove with the wire engaging the bottom of the groove, and forcing the fin walls laterally into tight gripping engagement with the groove walls by pressure exerted against the portion of the W intermediate the tin walls, said pressure upsetting and expanding the deformable wire insert laterally against the fin walls.

WILHCELM B. BRONANDER.

REFERENCES CITED The following references are of record in the file of. this patent:

UNITED STATES PATENTS Number Name Date 2,363,224 Bronander Nov. 21, 1944 754,195 Bullard Mar. 8, 1904 927,075 Reid July 6, 1909 851,977 Bigsby et a1. Apr. 30,1907 2,070,539 Muhleisen Feb. 9, 1937 805,510 Zent Nov. 28, 1905 912,546 Duryea s Feb. 16, 1909 

